A corpoba



T. SPENCER.

VENT FOR STORAGE BATTERIES.

APPLlcMloN man Nov. 2s

Patented Dec. 23, 1919.

INVENTOR.

.IAE PEN EER TTORNEY TI-m WITNESS lib dlt

THOMAS SPENCER, 0F FHELADELPHIA, PIENNSYLVANJIA, ASSIGNUR, Bll MESNE ASSIGN MENTS, T0 NATJEONAL CARBON COMPANY, INC., 0F CLEVELANJD TION UF NEW YORK.

'VENT FOR STORAGE BATTEFJFS.

Specicatton or' Letters latent.

Fateinted Mee.. 22, i212..-

npplicaton led November te, 1915. aerial No. 63,65%. I

`certain new and useful Improvement in Vents tor Storage Batteries, ot which lthe following is a full, clear, and exact descrlption. 1

This invention relates to vents tor storage batteries with special means it r preventing the overlilling of the jar. i

Since gas is generated in storage batteries during the' electrical action of the cell, means must be provided for the passagept such gas to the exterior, otherwise the yar or its cover would be ultimately broken by the pressure ot the gas.,

lnasmuch as portable storage batteries are extensively used by those having little or no knowledge or their proper care and usage, it is also desirable to have some means to prevent the overiilling ot the jar when water is added to the electrolyte from time to time to compensate for evaporation losses. ll accomplish both ot the above mentioned purposes by arrangements described 1n detail in the following specification and illustrated in the annexed drawings, in which Figure l is a partial sectional View of ay modified form of my invention. I

Fig. 2 is another view ot the modification shown in Fig. l.

Fig. 3 is a perspective View ot the lilling funnel shown in Fig; l.

Fig. a is a plan view ot the vent tube shown in Figs. l and 2.

dln Fig. l ll have shown a conventional torni ot storage battery in combination with a vent opening adapted to--receive my improvement. ln this ligure a vent tube 18 is secured in the cover 19 in any appropriate manner and preferably has an annular chamber 20, as shown. The upper end 2l ot the tube is threaded to receive a cap 22 and the lower opening 23 is made slightly conical to receive the shank ot a iilling fun nel described later. `An asphaltum or pitch seal 24 may be poured on top of the cover as shown.

lthen the storage battery is Ain use the cap 22 closes the tube 18 and seals the same Awith the exception oli vent openings in the cap which permit the escape et gas.

When water is to be added to the jar a special funnel 25, shown in perspective in Flg. 9i, is inserted in the vent tube atter removlng the cap 22. 'l`his funnel has one or more holes 26 through its lower portion or shank, which communicate with the exterior about midway up the tunnel. Freterably these holes terminate in an annular groove 27, as shown in Figs. l and 3.

When the tunnel has been inserted as illustrated in Fig. l, water can be readily poured into the jar, since the air will es cape through holes 26 and out between the funnel and the upper end of the tube meinber i8, as the tunnel shank makes a tight lit only with the lower opening 23. When the liquid level reaches the lower end oil the tunnel shank, as yshowin in Fig. l, no more water can be added to the cell, as the air 1s effectively trapped. Further addition of water will merely fill the tunnel and give a warning that the cell has been iilled to the proper height. then be-removed and the cap 22 screwed back into position.. i

The small holes in the tunnel shank can be omitted if the large -central hole is large enough, say about one inch in diameter, although the smaller tunnel with air vents is preferable.

Having described my invention, what l claim is zl. lin electric batteries, a battery jar, a cover therefor, a vent tube in said cover and a removable tunnel having a hollow shank adapted to seat inside the tube when the jar is to be filled said shank having one or more openings extending from the lower end to the exterior surface above said seat whereby air canpass to the exterior of the jar untilvthe liquid level reaches the lower i end ot the tunnel shank.

2. lin electric batteries, a battery jar, a cover therefor, a vent tube in said cover having an enlarged chamber, a threaded upper opening, a conical lower opening, and a tunnel having a shank adapted to extend through and seat inside said conical opening, said tunnel having one or more channels extending trom the lower end ot the shank to the exterior surface inside said enlarged chamber.

, oir-iro, 'a someone lllhe tunnel should blt lll@

lilith 3. ln electric batteries, a battery jar, a..

cover therefor, a vent tube in said cover having an enlarged chamber', a screw threaded upper opening and a lower opening, a funnel having a conical shank adapted to extend through and seat tightly in said lower opening, said funnel. having a groove around its exterior portion located in said chamber, and one or more channels extending from the lower end of the shank to said groove.

4. A cover provided With a filling opening, and a tube removably mounted in said opening so as to make an air-tight joint with .said cover, said tube extending a definite distance into the cell to which said cover is applied and being provided with an air venting passage independent of its main passage.

5. storage battery cover provided with a filling opening, a bushing therein and a tube removably mounted in the opening in said bushing so as to make an air-tlght joint therewith, said tube extending a definite distance into the cell to which said cover is applied and being provided with an air venting passage independent of said main passage.

n In testimony whereof I hereunto ailix my slgnature.

THOMAS SPENCER. 

